From da53c36ddd3f118a525a04faa8c47ca471e6c467 Mon Sep 17 00:00:00 2001
From: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Date: Mon, 12 Jun 2023 15:58:37 +0200
Subject: [PATCH] media: cec: core: add adap_nb_transmit_canceled() callback
Git-commit: da53c36ddd3f118a525a04faa8c47ca471e6c467
Patch-mainline: v6.6-rc1
References: git-fixes

A potential deadlock was found by Zheng Zhang with a local syzkaller
instance.

The problem is that when a non-blocking CEC transmit is canceled by calling
cec_data_cancel, that in turn can call the high-level received() driver
callback, which can call cec_transmit_msg() to transmit a new message.

The cec_data_cancel() function is called with the adap->lock mutex held,
and cec_transmit_msg() tries to take that same lock.

The root cause is that the received() callback can either be used to pass
on a received message (and then adap->lock is not held), or to report a
canceled transmit (and then adap->lock is held).

This is confusing, so create a new low-level adap_nb_transmit_canceled
callback that reports back that a non-blocking transmit was canceled.

And the received() callback is only called when a message is received,
as was the case before commit f9d0ecbf56f4 ("media: cec: correctly pass
on reply results") complicated matters.

Reported-by: Zheng Zhang <zheng.zhang@email.ucr.edu>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Fixes: f9d0ecbf56f4 ("media: cec: correctly pass on reply results")
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/media/cec/core/cec-adap.c | 4 ++--
 include/media/cec.h               | 6 ++++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/media/cec/core/cec-adap.c b/drivers/media/cec/core/cec-adap.c
index 241b1621b197..a9b73fb33888 100644
--- a/drivers/media/cec/core/cec-adap.c
+++ b/drivers/media/cec/core/cec-adap.c
@@ -385,8 +385,8 @@ static void cec_data_cancel(struct cec_data *data, u8 tx_status, u8 rx_status)
 	cec_queue_msg_monitor(adap, &data->msg, 1);
 
 	if (!data->blocking && data->msg.sequence)
-		/* Allow drivers to process the message first */
-		call_op(adap, received, &data->msg);
+		/* Allow drivers to react to a canceled transmit */
+		call_void_op(adap, adap_nb_transmit_canceled, &data->msg);
 
 	cec_data_completed(data);
 }
diff --git a/include/media/cec.h b/include/media/cec.h
index abee41ae02d0..6556cc161dc0 100644
--- a/include/media/cec.h
+++ b/include/media/cec.h
@@ -121,14 +121,16 @@ struct cec_adap_ops {
 	void (*adap_configured)(struct cec_adapter *adap, bool configured);
 	int (*adap_transmit)(struct cec_adapter *adap, u8 attempts,
 			     u32 signal_free_time, struct cec_msg *msg);
+	void (*adap_nb_transmit_canceled)(struct cec_adapter *adap,
+					  const struct cec_msg *msg);
 	void (*adap_status)(struct cec_adapter *adap, struct seq_file *file);
 	void (*adap_free)(struct cec_adapter *adap);
 
-	/* Error injection callbacks */
+	/* Error injection callbacks, called without adap->lock held */
 	int (*error_inj_show)(struct cec_adapter *adap, struct seq_file *sf);
 	bool (*error_inj_parse_line)(struct cec_adapter *adap, char *line);
 
-	/* High-level CEC message callback */
+	/* High-level CEC message callback, called without adap->lock held */
 	int (*received)(struct cec_adapter *adap, struct cec_msg *msg);
 };
 
-- 
2.35.3